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AGV Suspension

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I am trying to build an AGV robot with a load capacity of 250kg. I have selected the motors and the caster wheels and now I am working on the suspension mechanism. I want to build a rocker arm mechanism (see attached image) and I have a problem selecting the proper joint of this mechanism.

I think that bearings ( ball or roller bearings) are not suitable for this because of their size and that the mechanism is not rotating, it moves only 5 degrees which is not good for the bearings lubrifications.

Does anyone know what is the best joint type to use ?

Thank you in advance.

Screenshot 2021-10-21 111313.png

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